Schematic Diagram of Artificial Graphene in a Semiconductor (image) Columbia University School of Engineering and Applied Science Share Print E-Mail Caption Etched pillars define the positions of quantum dots (red puddles) arranged in an hexagonal lattice. When the spacing between the quantum dots is sufficiently small, electrons can move between them. Credit Diego Scarabelli/Columbia Engineering Usage Restrictions Please use the credit line: Diego Scarabelli/Columbia Engineering Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.